Improvement in rolling-mills



l l 2 Sheets-Sheet l.

'T. F. RUMBOLD.

Rolling Nlill.l

Patented sept. 15, 1863.

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l 2 Sheets-Sheet 2.' T. F. RUMBOLD.

n Rolling Mill. i No. 39,960. Patented Sept. 15,1863.

W/TNESSES.'

ATENT OFFICE.

T. F. RUMBOLD, OF ST. LOUIS, MISSOURI.

IMPROVEMENT IN ROLLING-MILLS.

Specification forming part of Letters Patent No. 39,960, dated September15, 1863; antedated June 2, 1863.

.To all whom t may concern.:

Beit known that I, T. F. RUMBOLD, ofthe city and county of St. Louis, inthe State of Missouri, have invented a new and useful Machine forRolling Metalin a Regular or Irregular Form; and I do hereby declarethat the following is aj'ull, clear, and eXact description of theconstruction and the operation of the same,reference being had to theaccompanying drawings, constituting a part of this specication, inwhich- Figure I, Sheet- I, is a side or front view of the machine,adapted for rolling tapering bars or beams without a curve beingimparted to them. Fig. 2 is atop view, and Fig. a transverse section, ofthe same. Fig. 4 is a modification of Fig. l plan. Fig. 5 is amodification vof the plans Figs. 1 and 4. Figs. 6 and 7 show two of theforms of iron that may be produced by the spiral mold-rollers.

Similar letters of reference in the several gures indicate correspond ingor similar parts.

The invention which I have developed consists in making rollers whosemolds, instead of passing around like common rollers in a rin glikeform, pass around in a spiral or screwlike form, thereby allowing theopportunity of gradually decreasing' or increasing the depth or width ofsaid groove or mold to a much greater length than on common rollers.

To enable others skilled in the art to make and use my invention, I willproceed to describe the same with reference to the drawings.

A B represents two rollers, constructed according to my invention, forrolling and tapering bars or beams, as shown in Fig. 6 (said figurebeing one of the many shapes that can be formed on this same principle,and will be used throughout this specification merely because it isconvenient to illustrate the principle.) The rollers are iitted oneabove another in a rolling-mill frame or housing, C C, in any of thewell-known ways, and are geared together, as atD D, so as to run atequal speeds. The circumference of the rollers have spiral or screw-likemolds formed on them by cutting spiral grooves into the metal. On oneroller this groove or mold turns from right to left and on the otherfrom left to right. The

flanges of the upper or larger roller, which form a guard or guide asthe iron is being rolled, match the grooves that are between the moldsor working-surface of the lower or smaller roller, and are so arrangedthat when the two rollers are geared together they (the ilanges of thelarger roller) extend into the grooves of the smaller roller to agreater or less extent, accordingly as the case may require; but in thisrespect the spiral-moldrollers do not differ from the common rollersthat are found in rolling-mills. Itis evident that the mold thus formedis continuous from one end ofthe rollers to the other end, and as theflanges a b are right and left handed and their depth graduallyincreased on one in one direction and gradually decreased on the otherin a reverse direction, the rollers, when in motion, present acontinually-changing workingsurface, c d, giving the impress of the moldto the metal as it passes between them, thus imparting the tapered formto the beam or bar of iron.

In Fig. 2 I have illustrated by red lines the gradual changes made in abar with all its sides parallel during the stage of its progress throughthe rolls. The bar, after being once introduced between the rolls, doesnot have to be removed and again inserted through another part of thesame rollers, but being l -once introduced it follows laterally thescrewl line of the mold, and at the same time feeds l longitudinallythrough the rollers, as illus- ,l trated in red. Although, as stated, itdoes l not have to be introduced a second time into the same rollers,yet the iron bar or beam will have to be inserted between differentrollers, having different sized molds on them, until it is brought tothe proper form 5 but in this re.

spect, also, the number of times the iron has to be passed between therollers does not differ from the common mode ot' rolling metal.

The great idea of my invention is this: The molds are made to passaround my rollers in this screw-like form, giving a much longer changingworkin g-surface than in the common rollers, whose molds only passaround once, allowing alterations only to the extent of thecircumference of the same, whereas in the spiral molds modifications asto the depth or width can be made at any point of the whole length ofsaid spiral mold, which pass several times around the rollers. The bars,when they are completed by the plans l, 2, and 3, are

Without a curved bend in them. They, hoW- l butit does produce a veryessential effect upon ever, may require to be trued, unless fed throughthe rollersJ under a tension, as practiced in the rolling of polishedshat'tin I have described the mold as being formed by cutting spiralgrooves into the metal ot' the rollers; but it is obvious that theymight be formed by constructing the spiraliianges sepai rate from therollers, and afterward applying them tirmly on rollers of propergraduallyrising outline. It also is obvious that the shape orconiiguration ot' the dautres, molds, and rollers maybe altered so as toproduce any ofthe known forms ot' beams or bars, as has been previouslystated, without departing from the principle involved in the spiral-moldrollers.

ln Fig. 4 the molds are represented as being` much wider than the angesor spaces between them. With this formation broader bars or pieces oi'iron can be rolled than in the increasing' the pitch ot' the same andadding to its depth.

By examining Fig. 4 it will be seen that the Working-faces c d areparallel with the axis of the rollers, notwithstanding the tact thatthese g faces united form a conie roller, or, in other i end of therollers to the other end of the same,

words, are formed on a conical foundation. This parallelism is necessaryin order to roll the bars without a curve being imparted te them.

the rollers A 13. the result of the rollers, so far as reducing andtapering or otherwise shaping the iron goes,

This change does not aifect the form of the iron. It, by reason of theconical shape of each section of the Working-face ofthe mold, due to theangle given thereto, gradually bends the bar into the form illustratedby Fig. 7. The extent and character ot' the bend imparted to the iron isjust in proportion to the degree of angle or inclination that theworking-surface of the rollers differ from the een ter line or axisofthe rollers, which degree of angle may be altered at pleasure and usedalong only a portion of the length of the rollers, in connection withthe workingsurt'ace on the other portions,which are parallel with theaxis of the rollers, or it may loe on the whole length ot the rollers,as represented. Now, with my invention, it' it is desired to rolltapered iron, or other metal of any form, whether square, flat, round,T-shaped, swelled, regular, irregular, tvc., either with or without acurved bend in it, it can be done by the employment of the spiral-moldrollers, the mold ot' said rollers being made the shape and size ot' theiron or other metal that is to be-rolled.

that I claim as my invention, and desire to secure by Letters Patent,is-

The forming ot the mold or working-surface around the rollers in spiralor screw-like form, making one continuous track from one so as to be thecounterpart ot' the bar or beam that is desired to be rolled,substantially as set Jforth.

T. F. RUMB OLD.

Witnesses XVILLIAM RUMBOLD, C. Tn. UHLMANN.

